Sanjay Gupta — University of Michigan in Ann Arbor

Gupta, a neurosurgeon, author, and reporter, graduated from the University of Michigan with a bachelor's degree in biomedical sciences.

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Warren Buffett — University of Nebraska–Lincoln

Thomson Reuters

Billionaire business investor Warren Buffet originally started college at the University of Pennsylvania, but transferred home and completed a degree in business administration at the University of Nebraska-Lincoln.

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Dick Costolo — University of Michigan

Getty

The former CEO of Twitter graduated from the University of Michigan in 1985 with a degree in computer and communication sciences. Costolo is currently a partner at venture capital firm Index Partners.